Multichannel echo canceller with a compander

Details Multichannel echo canceller with a compander Multichannel echo canceller with a compander

H - Electricity

04

B

H04B 3/23 (2006.01) H04L 25/08 (2006.01) H04M 1/74 (2006.01) H04Q 1/18 (2006.01)

Patent

CA 2267580

A compander circuit (20) for echo cancellation in telecommunications apparatus with an estimator module (21) for estimating an echo coupling and a delay of a line echo and with a characteristic module (23) with an associated multiplier (24) for controlling the short-time output level of Z OUT(k) as a function of the short-time input level of Z IN(k) is characterized in that at all inputs and outputs of the compander circuit (20), a plurality of N communications channels are applied and outputted, respectively, at an N-fold clock rate as compared with a single communications channel; that all memory units in the compander circuit (20) are designed as multiplexer-buffer-demultiplexer (MBD) units (30); and that a modulo-N counter (26) is provided which controls all MBD units (30) in such a manner that in each of the MBD units (30), always the same memory cell (35 1, 35 2, 35N) assigned to a particular communications channel is addressed. In this manner, a plurality of channels, preferably more than 2000 channels, can be handled simultaneously using a single compander, with only very little additional circuitry being required to modify the compander circuit.

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